Which five letter word can be added at the end of below word to form a
valid word?

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Find the mistake in the below maths equations

A = 2
A(A-1) = 2(A-1)
A2-A = 2A-2
A2-2A = A-2
A(A-2) = A-2
A = 1

What 4-letter word can be written forward, backward or upside down, and can still be read from left to right?

Its something that each of us devours,
Not just us but birds, beats, trees, and flowers,
Frets iron and nibbles steel,
Toil hard stones to meal,
Exterminates king, collapse town,
And blows the mountains down.

You are in a land where thirty men and two women were dressed in classic black and white dresses.
They begin to fight as soon as any of them move.

Where are you?

13 decks of cards have been mixed. What is the minimum number of cards that must be taken out from the above-mixed cards to guarantee at least one 'four of a kind?

Replace the question mark with the correct number, given the pair of numbers exhibits a similar relationship?

? : 3839 :: 11 : 1209

Identify The phrase in the picture.

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

Can you solve this amazing hard number series problem?
7, 8, 10, 12, 16, 18 ?